package com.leyou.search.service.impl;


import com.leyou.common.exception.LyException;
import com.leyou.item.client.ItemClient;
import com.leyou.search.dto.SearchRequest;
import com.leyou.search.pojo.Goods;
import com.leyou.search.repository.GoodsRepository;
import com.leyou.search.service.SearchService;
import com.leyou.starter.elastic.entity.PageInfo;
import org.apache.commons.lang3.StringUtils;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.Operator;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.nested.Nested;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;
import reactor.core.publisher.Mono;

import java.util.*;
import java.util.stream.Collectors;

@Service
public class SearchServiceImpl implements SearchService {

    @Autowired
    private GoodsRepository goodsRepository;

    @Autowired
    private ItemClient itemClient;

    @Override
    public Mono<List<String>> getSuggest(String key) {

        return goodsRepository.suggestBySingleField("suggestion", key);
    }

    @Override
    public Mono<PageInfo<Goods>> listData(SearchRequest searchRequest) {

        QueryBuilder queryBuilder = getQueryBuilder(searchRequest);

        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        //添加查询条件
        sourceBuilder.query(queryBuilder);

        int size = searchRequest.getRows();

        Integer page = searchRequest.getPage() == null ? 1 : searchRequest.getPage();

        int from = (page-1)*size;
        //page-1*size
        sourceBuilder.from(from);
        sourceBuilder.size(size);

        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.preTags("<am>");
        highlightBuilder.postTags("</am>");
        highlightBuilder.field("title");
        sourceBuilder.highlighter(highlightBuilder);

        //动态排序条件
        String sortBy = searchRequest.getSortBy();
        if (StringUtils.isNotBlank(sortBy)){
            sourceBuilder.sort(SortBuilders.fieldSort(sortBy).order(searchRequest.getDesc()?SortOrder.DESC:SortOrder.ASC));
        }


        return this.goodsRepository.queryBySourceBuilderForPageHighlight(sourceBuilder);

    }

    private QueryBuilder getQueryBuilder(SearchRequest searchRequest) {
        String key = searchRequest.getKey();
        if (StringUtils.isEmpty(key)) {
            throw new LyException(400, "请求参数有误");
        }

        BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder();

        //给查询构造条件添加查询条件
        boolQueryBuilder.must(QueryBuilders.matchQuery("title", key).operator(Operator.AND));

        //获取过滤条件,如果过滤条件不为空,则需要给查询构造条件,循环添加过滤条件
        Map<String, String> filters = searchRequest.getFilters();

        if (!CollectionUtils.isEmpty(filters)) {

            filters.entrySet().forEach(entry->{
                String eKey = entry.getKey();
                String eValue = entry.getValue();

                if ("分类".equals(eKey)) {

                    eKey = "categoryId";
                    boolQueryBuilder.filter(QueryBuilders.termQuery(eKey, eValue));
                } else if ("品牌".equals(eKey)) {
                    eKey = "brandId";
                    boolQueryBuilder.filter(QueryBuilders.termQuery(eKey, eValue));
                }

            });
        }

        return boolQueryBuilder;
    }

    @Override
    public Mono<Map<String, List<?>>> listFilter(SearchRequest searchRequest) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        //添加查询条件
        sourceBuilder.query(getQueryBuilder(searchRequest));


        sourceBuilder.aggregation(AggregationBuilders.terms("brandAgg").field("brandId").size(20));

        sourceBuilder.aggregation(AggregationBuilders.terms("categoryAgg").field("categoryId").size(20));

        //过滤条件的聚合 以及过滤条件的值的聚合
        sourceBuilder.aggregation(
                AggregationBuilders.nested("specAgg", "specs")
                        .subAggregation(AggregationBuilders.terms("nameAgg").field("specs.name")
                                .subAggregation(AggregationBuilders.terms("valueAgg").field("specs.value"))));

        Mono<Aggregations> aggregationsMono = this.goodsRepository.aggregationBySourceBuilder(sourceBuilder);



        return aggregationsMono.map(aggregations -> {

//            过滤条件的封装集合
            Map<String, List<?>> resultMap = new LinkedHashMap<>();

            //解析品牌聚合,获取到品牌id后,根据品牌集合id查询对应的品牌集合
            Terms brandAgg = aggregations.get("brandAgg");

            List<Long> brandIds = brandAgg
                    .getBuckets()
                    .stream()
                    .map(bucket -> ((Terms.Bucket) bucket).getKeyAsNumber())
                    .map(Number::longValue)
                    .collect(Collectors.toList());
            //解析分类聚合,获取到分类id后,根据分类集合id查询对应的分类集合
            Terms categoryAgg = aggregations.get("categoryAgg");

            List<Long> categoryIds = categoryAgg
                    .getBuckets()
                    .stream()
                    .map(bucket -> ((Terms.Bucket) bucket).getKeyAsNumber())
                    .map(Number::longValue)
                    .collect(Collectors.toList());

            if (!CollectionUtils.isEmpty(categoryIds)){
                resultMap.put("分类",  this.itemClient.queryCategoryByIds(categoryIds));
            }

            if (!CollectionUtils.isEmpty(brandIds)){
                resultMap.put("品牌", this.itemClient.listBrandByIds(brandIds));
            }

            //解析规格参数的nested的聚合
            Nested specAgg = aggregations.get("specAgg");

            //获取名称聚合
            Terms nameAgg = specAgg.getAggregations().get("nameAgg");

            //遍历名称分桶
            nameAgg.getBuckets().forEach(bucket->{
                //获取每个具体名称值
                String key = bucket.getKeyAsString();

                //获取当前名称聚合的子聚合
                Terms valueAgg = bucket.getAggregations().get("valueAgg");
                //把名称对应的值 封装成数组
                List<String> valueList = valueAgg.getBuckets()
                        .stream()
                        .map(
                                valueBucket ->
                                        ((Terms.Bucket) valueBucket)
                                                .getKeyAsString()).collect(Collectors.toList());
                resultMap.put(key, valueList);
            });


            return resultMap;
        });


    }
}